Railway signaling.



T, S. STEVENS.

RAILWAY SIGNALI'NG, AP PLzcAnmq FILED XUNE 7. 1912.

Patenmd Sept, 7; 1915 3 SHEETS-SHEEI a.

' 'INVENTOR. 1

' AT NEi WHMSSES m {mi/hm T. S. STEVENS.

RAILWAY SIGNALING. APPLICATION HLED JUNE 1. 1912.

Patented Sept. 7, 1915.

3 SHEETSSHEET 2.

v ATTORNEY.

INVENTOR. a?

aim/m a GE WITNESSES WV T. S. STEVENS,

RAILWAY SIGNALING.

mu) JUNE ifmz.

APPLICATlGN 1,15%.Ms,

Pntenfedfiept. 7, 1915.

-3 SHEETS-SHEET 3.

.. m UE WITNESSES g/fl/ Y MMA is: 7a:

ersirssrxrnnr oFFroE.

H'TG'PEKA, KANSAS, ASSIGNOR TO THE UNION SWITCH & SIGNAL EVA-I 1:3,PENNSYLVANIA, A CORPORATIGN OF PENNSYLVANIA.

RAILWAY SIGNALING.

e. P535) s Specification of Letters Pctent.

implication filed June 7, 1912. Serial No. 702,209.

' T may concern at I, Tnosms S. STnrnN's,

n of one united States, residing, at

in. the county of Shawnee and State invented certain new and in RailwaySignaling,

. lowing a. specification.

' on relates to the uutonm-tic con- .ipply of energy to certain dcmay heregulated.

cularly my invention relates to control of lamps or other energy in arailway sige control being such that u, current is supplied to s .ioesin advance of the our invention is applied tom and specili l of thecurrent iloyed in such dong the rail- 1 of a portion of a rail-.-lii.--:l thereto a cling v invention. Figs. 2 s but illustrating1nodiring; my invention. cc chirccters designnte f the figures.

' invention I provide 'ucl *cuit which truck circuit 'ie supply ofdevice such nice of the no of my insi nuling i; iished, and the nductedonly when .W l that signal, and n economy in the operation of obtained.The same he ohsuined with other rings, in each designate three a railwaytrack,

consumption of energy proceeds along the railwaywhich sections areprotected respectively by railway signals S. S and S Each of thesesignals as here shown comprises a semaphore for daylight indications andan electric lump L, Lhor L for night indicutions; The block sections areprovided with track circuits; as here shown one track circuit isprovided for each block section although it is understood that I do notlimit myself to this particular number. As usual, each track circuitcomprises a source of signaling current, the track rails of the blocksection or portions of them, and a track relay. As here shown thesources of signaling current are transformers T, T T etc, the secondarywindings 10, 11 and 12 of which are connected with the track rails ofthe block sections. The primary windings of these transformers T, T Tetc, are connected with transmission conductors 13 which are suppliedwith an alternating current from any suitable source, which source isnot shown in the drawings.

ll, R and R are track relays which may he oi. any desired type operableby an alternating signaling current. They are of the induction motortype each comprising a winding connected with the track rails, and ashort-circuited member which actuutes contacts for the control of thesignal for the corresponding. block section. For example. the contactsoperated by relay R control the circuit for signal S the source ofcurrent for which circuit is another secondary winding 14 of transformerT The circuits for signals S and S? are similarly controlled by trackrelays R and R respectively.

Included in each track circuit between the source of current and thetrack rails are means for the control of the supply of current to thesignal lamp for the next succeeding block section. I will now describethree forms of means for such control, refer-ring separately to each ofthe views.

Referring to Fig. 1,.the means here shown is in'the form of a re1sy,'17,18, 19, designate circuit which includes a source of current and acontact or contactswhich are opened and closed by the armature of therelay device for the preceding track circuit. For example, "the circuitfor lamp L includes a secondary winding 20 of transformer T and acontact or contacts 21 which are controlled ttythe relay 18. Each relay,17, 18, 19, etc, is so adjusted that when the rails of the track circuitare not occupied by a car or train, the current which flows in thewinding of the relay is not sufiicient to have it attract its armatureto close the contact 21; but when the rails of the track circuit arebridged by a car or train, thereby shunt ing out the resistance of thetrack winding of relayR, the increased current drawn from the source10,11 or 12 flowing through the winding of the relay is suflicient tohave the relay attract its armature to close the contact 21. Hence whenblock section A is occupied by a car or train as indicated by the wheelsand axle IV, lamp L of signal S v becomes illuminated Lamps L and L arecontrolled respectively by relays 17 and 19 in a similar manner.,

Referring now to Fig. 2, a lampcontrolling means is here showncomprising a trans-v former 22, 23 or 24, whose-primary winding 15lncluded in atrack circuit and whose secondary wlndmg is connectedWlllll a relay 25, 26 or 27. Each relay 25, 26 and 27 controls a contactor contacts included in the lamp circuit like that illustrated in Fig.1.

The adjustment of the parts is such that when the block section A isunoccupied, the

current in the, primary of transformer, 23'

is insufficient to cause relay 26 tobe energ zed, but that when blocksection A is occu:

pied by a car; or train indicated by the wheels and axle W, theincreased current in the primary of transformer 23 causes relay 26 to beenergized so that its armature closes the circuit for lamp L The controlof signal lamps L and L by transformers and 24 and relays 25 and 27 issimilar to that just explained for lamp L Referring now to Fig. 3, thelamp controlling means hereshown is similar to that shown in 'Fig. '2,except that the signal lamps are energized directly from the secondariesof transformers 22, 23, and 24 respectively, instead of through a relaydevice. For examplelamp L is connected directly in circuit with thesecondary of transformer 23. The parts are so adjusted that when blocksection A is unoccupied, the current. in the primary of transformer 23is insuflicient to illuminate lamp L or is at the most sufiicient toilluminate the lamp only faintly. but that when block section A isoccupied by acar or train as indicated by the wheels and axle \V. thecurrentdrawn from the source 11 is then sutlicient to cause the fullillumination of lamp L Although-I have herein shown and de-v scribed onlthree forms of apparatus and circuits embodying my invention, it isunderstood that various changes and modifications may be made thereinwithin the scope of the appended claims without departing from thespirit and scope of my invention.

Having thus described my invention, what I claim is a .1. Incombination, a plurality of succe sive sections of a railway track;track circuits for the sections each including a source of energy and atrack relay connected with the rails of a section; signals for thesections controlled by said track relays, lamps for the signals forgiving signal indications at night, a second relay for each sectionreceiving energy from the connection between the source of energy and arail of the section, and a circuit for a lamp of each signal, said lampcircuit being controlled by said second relay for the section in therear. 2. In combination, a plurality of successive sections of a railwaytrack; track circuits for the sections each including a source ofalternating current and a track relay connected with the rails of asection; signals for the sections controlled by said track relays, lampsfor the signals for givin signal indications at night, a transformer oreach section whose primary receives current from the connection betweenthe source of current and one rail of the section and a circuit for .alamp of each signal, said lamp circuit being controlled by the secondaryof the transformer for the section in the rear.

3. In combination, a railway track divided into a plurality ofsuccessive sections, track circuits for the sections each comprising asource of current connected with the rails and a track relay'alsoconnected with the rails, signals for the sections controlled bysaid'rela-ys, -lamps for the signals for giving signal indications atnight, and means for each section receiving current from the connectionof' the source of current with a rail of the section for controllingthelamp of the signal. for the section next in advance.

4. In combination, a plurality of successive sections of a railwaytrack, means for each section for supplying signaling ourrent to therails of the section, a relay for trical devicebein'g arranged to beshort-circnited when a train enters the block section illuminated.

including the circuit containing said electrical device, and therebycausing an increased flow of current from the source of W1tnesses:

current contained in saidlcirc uit a signal device for each of the sandblock sections,

and electrical-means whereby upon said in- In testimony whereof I aflixmy signature in presence of two witnesses.

THOMAS s. STEVENS.

Bum T. ANDERSON, RALPH C. SHAY.

